body {
	margin: 0;
	padding: 0;
	height: 100vh;
	display: flex;
}

.wrap {
	margin: auto;
}

#canvas {
	display: block;
	margin: -20px auto 20px;
}

#controller {
	width: 600px;
	margin: 0 auto;
}

.clearfix {
	clear: both;
}

.op-btn {
	float: right;
	width: 10%;
	height: 30px;
	line-height: 30px;
	color: #fff;
	font-family: 'Microsoft YaHei';
	font-size: 13px;
	text-align: center;
	background: #3498DB;
	letter-spacing: 1px;
}

.op-btn:hover {
	background: #2980B9;
	cursor: pointer;
}

#clear-btn {
	margin-right: 1.5%;
}

.color-btn {
	width: 10%;
	height: 30px;
	float: left;
	margin-right: 1.5%;
	transition: all 0.3s;
}

.color-btn:hover {
	box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.3);
	cursor: pointer;
}

.selected {
	box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.3);
}

#black-btn {
	background: #2C3E50;
}

#blue-btn {
	background: #2980B9;
}

#green-btn {
	background: #16A085;
}

#red-btn {
	background: #C0392B;
}

#orange-btn {
	background: #E67E22;
}

#yellow-btn {
	background: #9B59B6;
}